Rainfall-runoff Analysis Method Considering the Effect of High-rise Buildings

Abstract

In this study, a rainfall runoff process analysis method considering the effect of high-rise buildings was proposed. The proposed method was applied to the Yeoksam urban basin in Seoul. For rainfall-runoff analysis, a shot noise process based model was used to independently analyze the runoff from the wall and roof of a high-rise building. Thus, the Yeoksam urban basin was divided into 155 sub-basins for analysis. It was observed that the peak runoff increased by 22.0% in the 9-2 sub-basin. However, in a sub-basin in which the peak runoff increased by 10.0% or more due to high-rise buildings, there was no case where the increase rate of peak runoff was maintained greater than 5.0% until the next sub-basin outlet. Finally, by deriving the runoff hydrograph for the entire Yeoksam urban basin, it was observed that there was no significant difference in rainfall-runoff process, regardless of whether the building was considered. Therefore, it was concluded that the phenomenon of increase in peak runoff due to high-rise buildings occurs only in sub-basin units.